Missing OpenColorIO.dll for game engine executable
Probably all the dlls are mimssing. When you export your file as a game executable, you should check the box "Copy dlls".
Anyway, check it was actually made : in the chosen directory, you should find :
- the .exe file
- a folder labeled according to your blender version
- all the required dlls
To get your exe running on a computer without blender, you should send all these files.